How to check grammar while writing online

Joseph Hu

Joseph HuLast reviewed September 4, 2026

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Browser spellcheck catches obvious typos, but it rarely explains an awkward sentence or a missing article. Grammar extensions work where you already write and can offer corrections before a message is sent. The important differences are language coverage, rewriting depth, account requirements, and what text the service processes.

Use browser spellcheck for a quick final pass

Built-in spellcheck is enough for obvious typing mistakes and keeps the workflow simple when you do not want a writing service active on every page.

  1. 1Turn on spellcheck in your browser settings and choose the languages you use.
  2. 2Review underlined words and add genuine names or terms to your dictionary.
  3. 3Read the final text aloud to catch missing words and unnatural phrasing.

Spellcheck does not provide much help with grammar, tone, or sentence structure. An extension is more useful for writing you revise throughout the day.

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Check grammar, clarity, and tone in everyday English writing

Grammarly is the most complete all-round option here when most of your writing is in English and you want suggestions inside the sites where you already work.

Grammarly

Grammarly is the strongest all-round choice when you write mainly in English and want grammar, clarity, and tone suggestions in the same place. It works inside common web editors, so you can review a sentence without moving it into a separate checker.

Grammarly adds suggestions directly to browser text fields. Its free tier covers spelling, grammar, punctuation, clarity, and tone, while paid plans add deeper rewrites and more specialized feedback.

  • Checks spelling, grammar, and punctuation while you type.
  • Suggests clearer wording and flags how the tone may sound to a reader.
  • Works across common email, document, social, and publishing tools.

Trade-offs

  • The store disclosure says it handles personally identifiable information, personal communications, location, user activity, and website content.
  • Full-sentence rewrites and more advanced feedback require a paid plan.

Check grammar across several languages without an account

Language coverage and a low-friction start matter more than generative writing when you mainly want corrections as you type.

LanguageTool

LanguageTool is the clearest fit when you want grammar and style help rather than a large AI writing suite. It starts without an account and supports more than 25 languages and regional varieties.

It checks spelling, grammar, punctuation, commonly confused words, and style while you type across many websites.

  • Supports more than 25 languages and multiple English variants.
  • Checks grammar and style in common email, document, and social apps.
  • Works without registration for the core experience.

Trade-offs

  • Text is sent to LanguageTool over an encrypted connection by default.
  • Advanced style and rewriting features have premium limits.

Rewrite sentences as well as correcting mistakes

Choose a writing assistant when awkward phrasing and tone take more time than spelling and punctuation.

Linguix

Linguix is a focused alternative when you want grammar, punctuation, and rephrasing without adopting the largest writing platform. Its extension stays close to the text field and supports six core writing languages.

Linguix checks grammar and punctuation in real time and adds paraphrasing and AI-assisted rewriting in common web writing tools.

  • Checks English, French, German, Spanish, Portuguese, and Polish.
  • Combines corrections with one-click sentence rewriting.
  • Works in Gmail, Google Docs, social platforms, and other text fields.

Trade-offs

  • Its store audience and review sample are smaller than LanguageTool or QuillBot.
  • The listing says it handles personal communications and personally identifiable information.

QuillBot

QuillBot is the broader option for people who routinely reshape sentences, not just correct them. Grammar checking sits beside paraphrasing, summarizing, tone, and generative writing tools.

The extension works in browser text fields and combines grammar checking, paraphrasing, rewriting, AI detection, and drafting tools.

  • Corrects grammar, spelling, and punctuation while you write.
  • Rephrases sentences with tone and style controls.
  • Includes summarization, drafting, and other AI writing tools.

Trade-offs

  • Free paraphrasing and advanced suggestion use is limited.
  • The store disclosure includes personal communications, location, and website content.

Compare the solutions

You write mainly in English and want one tool for corrections, clarity, and tone

Grammarly

Its browser extension combines core grammar checks with clarity and tone suggestions across common writing sites.

Trade-off: The Chrome Web Store says the extension handles personal communications, website content, and other user data; consider that before using it with sensitive text.

You want multilingual grammar checking with no required account

LanguageTool

It supports more than 25 languages and can start checking without registration.

Trade-off: Text is sent to LanguageTool by default for processing.

You want focused rewriting in six supported languages

Linguix

It combines live grammar corrections with compact paraphrasing and writing tools.

Trade-off: Its user base and rating sample are much smaller than the largest alternatives.

You also need paraphrasing and drafting tools

QuillBot

Its extension goes beyond corrections into sentence rewriting, tone, summarization, and generation.

Trade-off: The broader AI features and free limits may distract from simple proofreading.

Store data comes from a daily crawl of the Chrome Web Store; rating trends are computed from the public review history. Recommendations are editorial judgements, last reviewed on , with store figures from .

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Sources

Product details and availability are checked against the linked official sites and Chrome Web Store listings. Sources support factual product information; the recommendation itself is an editorial judgement.

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